Steam vacuum-pump.



A. H. SMYTHE.

STEAM VACUUM PUMP.

APPLICATION FILED JAN.27, I916.

Patented May 23, 1916.

2 SHEETS-SHEET I.

A. H. SMYTHE.

STEAM VACUUM PUMP. APPLICATION FILED IAN-27. 19m

Patented May 23,1916.

2 $HEETS-SHEET 2. v

THE COLUMBIA PLANOGRAPH co., WASHINGTON, D. c. I

AER-AM H. SIVIYTI-IE, 0F ALEXANDRIA, VIRGINIA,

ASSIG'NOB TO THE EMERSON PUMP AND VALVE COMPANY, OF-ALEXANDRIA, VIRGINIA, A CORPORATION OF VIRGINIA.

STEAM VACUUM-PUMP.

Specification of Letters Patent.

Patented May as, rare.

Application filed. January 27, 1916. Serial No. 74,636.

To all whom it may concern Be it known that I, ABRAM I-I. SMYTHE, a citizen of the United States of America, and resident of Alexandria, in the county of Alexandria and State of Virginia, have invented certain new and useful Improvements in Steam Vacuum-Pumps, of which the following is a specification.

This invention relates to steam vacuum pumps and has for its object in part the provision of novel means for controlllng supplies of steam to the cylinders or jackets forming the vacuum chambers of pumps of this character, the said invention also including novel valve operating mechanism whereby the said valve may be actuated or operated for controlling ducts leading to the cylinders without employing a great amount of steam or other motor driving media.

A further objectof this invention is to produce a controlling mechanism of the character indicated which will operate without the use of lubricants which would contaminate water being circulated by the pump and a still further object of the invention is to provide novel means for balancing the valve to minimize the friction and reduce the requirements for power to operate the said valve.

A still further object of this invention is to provide novel means whereby a valve of this character and its operating mechanism may be incased so that they are fully protected from the elements or from dust, or from other injurious contents of the fluid being pumped.

With the foregoing and other objects in view, the invention consists in the details of construction and in the arrangement and combination of parts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will be had to the accompanying drawings forming part of this specification wherein like characters denote corresponding parts in the several views, and in which- Figure 1 illustrates a View in elevation, fragments of the cylinders or cases with the valve casing and motor for driving the same applied thereto; Fig. 21 illustrates an enlarged sectional view on the line 22 of Fig. 1; Fig. 3 illustrates a sectional view on the line 3-3 of Fig. 2; Fig. 4; illustrates a sectional view on a line corresponding with the line tlof Fig. 3; Fig. 5 illustrates a perspective view of a valve and an arm associated with it; Fig; 6 illustrates a sectional view of the said valve; and Fig. 7 illustrates a view in elevation, partly in section, of a valve driving gear.

In these drawings 10 denotes the cylinders or casings forming the condensing chambers andfor the purpose of uniformity of terms, these elements will be hereinafter referred to as cylinders, by which term is understood that I mean any casing, jacket or shell c011- stituting a closure forming a chamber for the purpose intended. It is furthermore understood that these cylinders are to be supplied at their bottoms with controlling valves of any general type suitable for the purpose, one embodiment of these controlling valves being illustrated in the patent to R. B. Emerson, numbered 773,133, dated Oct. 25, 1904:.

The means for admitting steam to the cylinders includes a casing 11 having branches 19. and 13 with ducts 1 1 and 15 respectively, which ducts merge or communicate with a valve chamber 16 formed in the casing. A steam supply pipe 17 is threaded in the wall of the casing and communicates with the valve chamber and the said valve chamber contains a cup-shaped valve 18 having ports 19 and 20 adapted to be moved alternately into alinement or registry with the ducts 14 and 15 respectively, so that steam is admitted to the cylinders alternately as is common in. this class of pumps. The bottom of the valve has ports 19 which admit steam to the under surface of the valve for the purpose of balancing the said valve and mini mixing friction, due to the existence of the pressure of the steam.

In the present embodiment of the invention, a valve driving motor and gear are provided and as here shown, the said motor comprises a three-cylinder steam engine 21 which may be of the general construction of the engine shown in the patent to IV. It. Emerson, numbered 828,100, dated August 7, 1906, and therefore, the details of construction of said engine will notbe given except to say that the link coupling 22 is connected to a crank 23. The crank which is driven by the engine is connected to the crank shaft 24; and the said crank shaft is suitably journaled in a part of the strucf uniform and sudden than when the steam is delivered in an unbroken or scattered jet.

*thereon which engagethe teeth of a ture forming the crank case. The crank shaft near its upper end has gear teeth 25 gear Wheel 26. The gear wheel 26 is rotatable on' a stud 27 and carries a pin 28 which, in

the-present embodiment" of the invention, is

threaded in anaperture 29 in said gear wheel '26. The upper extremity 30 of the ,crank shaft 24 enters a recess31 formed. in

the lower wall ofthe valve and the valve is rotatable or partially rotatable on the upper :end of the said crank shaft. The valve is further provided with an arm 32 having a longitudinally disposed slot 33 into which the pin 28 extends when the parts are in assembled relation and as the gear wheel 26 rotates, the pin 28 communicates motion to the arm 32 and oscillates the said arm, thereby communicating partial rotary motion to the valve to effect the relation of theports and ducts heretofore described and to openings ofthe ducts and it has been found in practicethat when steam is so spread, the action of the condensing medium 1s more The valve mechanism heretofore described being intended; for use in connection with a steam vacuum'pump in which stream is "admitted tothe cylinders 10 and condensed therein by cooling the steam, asby the in- ,troduction of water into thecylinders, it

follows that when the pistons of the motor are operated they rotate, (through the confnecting rod' and parts associated therewith) I V the crankshaft having the gear teeth 25 and the gear teeth in turn mesh with the teeth of the gear wheel 26, thus the gear wheel is rotated as stated heretofore in the specification. The gear wheel 26 is rotated on the stud 27 which carries the pin 28 which is V 1 threaded in the'aperture 29 in the gear wheel 26,-sothat when the gear wheel 26 is rotated, 'it carries'the pin 28. vThe valve :has an arm 32 with a slot in which the pin'28 moves so that as the gear wheel 26 is rotated and as the ,pin 28 rides in theslot of the'arm, the

' Copiesof tmslpatentimay he obtained for valve is oscillated. The valve has ports which register, in certain positions, with ducts leading to the cylinders and the relation is such that this valve controls the passage of steam which is delivered to the pipe 17 so that said steam reaches the cylinders alternately, it being understood that when steam is being delivered to one cylinder, steam which had previously been delivered to the other cylinder is being condensed by water delivered thereto as well known in this art. The continuous movement, therefore, of the motor, for operating the valve, controls the supply of steam to the cylinders.

I claim 1. In a device relating to vacuum pumps, cylinders, a valve casing having a valve chamber, branches extending from the valve casing, said branches having ducts communicating with the valve chamber, a cupshaped valve oscillatably mounted in the valve casing, said valve having ports for communicating alternately with the ducts, a slotted arm rigid with the said valve, said valve having a recess in its bottom, a crank shaft having its extremity seated in the recess of the valve and forming a bearing for said valve, gear teeth on the crank shaft, a gear wheel mounted to rotate in the casing and meshing with the gear teeth of the crank shaft, a pin on said wheel extending 7 into the slot of the arm for communicating motion to the arm, and means for rotating the crank shaft.

[2. In a device relating to vacuum pumps, cylinders, a valve casing having branches secured to the cylinders, said branches having ducts communicating with the interior of the cylinders, a cup-shaped valve having ports in its side walls for alternately communicating with the ducts, the bottom wall of said valve having ports therein for admitting steam to equalize pressure on the said valve, a slotted arm rigid with said valve, a gear wheel having a pin extending into the slot of the arm, a crank shaft having teeth meshing with the gear wheel, the said valve having a seat in its under surface for the reception of the end of the crank shaft, and means for rotating the crank shaft.

In testimony whereof, I aflix my signature in the presence of two witnesses:

V V A. II. SM-YTHE. Witnesses:

J N0. W. Cmnnnnss,

FRANK C. CREIGIrroN. 1

five cents each, by addressing the Commissioner of Patents, Washingtoml). 0. l 

